v4.19.13 snapshot.
diff --git a/tools/include/linux/ftrace.h b/tools/include/linux/ftrace.h
new file mode 100644
index 0000000..949f541
--- /dev/null
+++ b/tools/include/linux/ftrace.h
@@ -0,0 +1,4 @@
+#ifndef _TOOLS_INCLUDE_LINUX_FTRACE_H
+#define _TOOLS_INCLUDE_LINUX_FTRACE_H
+
+#endif /* _TOOLS_INCLUDE_LINUX_FTRACE_H */